Do keep in mind if this house is in Philadelphia you have to consider the freezing weather and you don't want busted/frozen pipes.

I've never owned forced air but every home my parents did was freezing in the basement no matter what they tried.

You know why...there's not a single advantage to freezing their money into someone else's account without access to it.   

Plus the low taxes and insurance, and you never have to worry about freezing pipes!

When I replace, I'm using Pex, which is cost effective and holds up better with freezing temps..

My husband and I were tossing around the idea of purchasing a condo in Galveston to use as a short term rental during the spring/summer/fall and when it gets freezing cold up here, we have a place to escape to that's warm. 

Happy New Year DouglasYour talking to a California Boy here Douglas, whose spent more time on a skateboard than a snowboard and thats the Gods honset truth.But I'll give it a tryYou should consider insulating both your hot and cold copper lines with the heaviest poly foam insulation you can buy,,,i'm talking 3/4 to 1" thick and I mean every linear foot of pipe,,,,Now having said that,its my understanding that in colder climates there are systems where you actually wrap your water supply piping with heating wire to prevent freezing,Of course the key here is you must have 24/7 electrical power to the wiring.Now to my new friend Alex M,,,In a word Alex ,youre off to a good start,,,,,For my money ,your cant beat the Noritz tankless water heater products,,,,in the first place,,,if you have a troubleshooting issue ,they send their tech guy out to your house to check out your problem with your unit,,,you heard me right,,,Secondly ,they are a class act,,,,I'll say it like this ,,,contractors like myself LOVE THEM ,,,because we get no call backs from Noritz products,,,,Bare in mind ,,,the secret to tankless is;You want to install them on an outside wall ,,,why?

It comes slowly, temps slowly averaging lower and lower until a freeze arrives and then the long winter begins.I think that is what is going on now.

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Hell might freeze over before they get their shoe laces tied.